Erratum: "Correction factors for ionization chamber dosimetry in CyberKnife: Machine‐specific, plan‐class, and clinical fields" [Med. Phys. 40, 011721 (10pp.) (2013)]. Issue 5 (16th April 2013) - Gago‐Arias, Araceli; Antolín, Elena; Fayos‐Ferrer, Francisco; Simón, Rocío; González‐Castaño, Diego M.; Palmans, Hugo; Sharpe, Peter; Gómez, Faustino; Pardo‐Montero, Juan